Support presets in Gtk UI.

git-svn-id: http://svn.drobilla.net/lad/trunk/jalv@3878 a436a847-0d15-0410-975c-d299462d15a1

1 files changed, 94 insertions, 0 deletions

diff --git a/src/presets.c b/src/presets.c
new file mode 100644
index 0000000..bf7fd78
--- /dev/null
+++ b/src/presets.c
@@ -0,0 +1,94 @@
+/*
+  Copyright 2007-2011 David Robillard <http://drobilla.net>
+
+  Permission to use, copy, modify, and/or distribute this software for any
+  purpose with or without fee is hereby granted, provided that the above
+  copyright notice and this permission notice appear in all copies.
+
+  THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+
+#include "jalv-config.h"
+#include "jalv_internal.h"
+
+#define NS_LV2  "http://lv2plug.in/ns/lv2core#"
+#define NS_PSET "http://lv2plug.in/ns/ext/presets#"
+
+#define USTR(s) ((const uint8_t*)s)
+
+int
+jalv_load_presets(Jalv* jalv, PresetSink sink, void* data)
+{
+	LilvNodes* presets = lilv_plugin_get_related(jalv->plugin,
+	                                             jalv->preset_class);
+	LILV_FOREACH(nodes, i, presets) {
+		const LilvNode* preset = lilv_nodes_get(presets, i); 
+		lilv_world_load_resource(jalv->world, preset);
+		LilvNodes* titles = lilv_world_find_nodes(
+			jalv->world, preset, jalv->label_pred, NULL);
+		if (titles) {
+			const LilvNode* title = lilv_nodes_get_first(titles);
+			sink(jalv, preset, title, data);
+			lilv_nodes_free(titles);
+		} else {
+			fprintf(stderr, "Preset <%s> has no rdfs:label\n",
+			        lilv_node_as_string(lilv_nodes_get(presets, i)));
+		}
+	}
+	lilv_nodes_free(presets);
+
+	return 0;
+}
+
+static inline const LilvNode*
+get_value(LilvWorld* world, const LilvNode* subject, const LilvNode* predicate)
+{
+	LilvNodes* vs = lilv_world_find_nodes(world, subject, predicate, NULL);
+	return vs ? lilv_nodes_get_first(vs) : NULL;
+}
+
+int
+jalv_apply_preset(Jalv* jalv, LilvNode* preset)
+{
+	LilvNode* lv2_port   = lilv_new_uri(jalv->world, NS_LV2 "port");
+	LilvNode* lv2_symbol = lilv_new_uri(jalv->world, NS_LV2 "symbol");
+	LilvNode* pset_value = lilv_new_uri(jalv->world, NS_PSET "value");
+
+	LilvNodes* ports = lilv_world_find_nodes(
+		jalv->world, preset, lv2_port, NULL);
+	LILV_FOREACH(nodes, i, ports) {
+		const LilvNode* port   = lilv_nodes_get(ports, i);
+		const LilvNode* symbol = get_value(jalv->world, port, lv2_symbol);
+		const LilvNode* value  = get_value(jalv->world, port, pset_value);
+		if (!symbol) {
+			fprintf(stderr, "error: Preset port missing symbol.\n");
+		} else if (!value) {
+			fprintf(stderr, "error: Preset port missing value.\n");
+		} else if (!lilv_node_is_float(value) && !lilv_node_is_int(value)) {
+			fprintf(stderr, "error: Preset port value is not a number.\n");
+		} else {
+			const char*  sym = lilv_node_as_string(symbol);
+			struct Port* p   = jalv_port_by_symbol(jalv, sym);
+			if (p) {
+				const float fvalue = lilv_node_as_float(value);
+				jalv_ui_write(jalv, p->index, sizeof(float), 0, &fvalue);
+			} else {
+				fprintf(stderr, "error: Preset port `%s' is missing\n", sym);
+			}
+		}
+	}
+	lilv_nodes_free(ports);
+
+	lilv_node_free(pset_value);
+	lilv_node_free(preset);
+	lilv_node_free(lv2_symbol);
+	lilv_node_free(lv2_port);
+
+	return 0;
+}